Abstract
.The heavy actinide nucleus 253No (Z = 102) was studied using the (S)ilicon (A)nd (Ge)rmanium (SAGE) spectrometer allowing simultaneous in-beam gamma-ray and conversion electron spectroscopy at the accelerator laboratory of the University of Jyväskylä. Using the recoil-tagging technique, gamma-electron coincidences have allowed for the extension of the level scheme in the lower-spin region of the yrast band. In addition, internal conversion coefficient (ICC) measurements to establish the multipolarity of transitions have been performed. Measurement of the interband-intraband branching ratios supports the assignment of the Nilsson band-head configuration 9/2^{-}[734] assigned in previous studies. The study shows the viability of combined in-beam electron and gamma-ray spectroscopy down to μb cross sections.
Highlights
In-beam studies in the heavy element region around Z ∼ 102 have proven fruitful, as they probe the single-particle orbitals originating from spherical nuclei around Z = 120
After compound nucleus formation, the emission of two neutrons, and prompt γ rays and electrons, the evaporation residues passed through the ritu gas-filled separator and were implanted into the great focal-plane spectrometer [14] for decay spectroscopy measurements
The experiment was performed at jyfl, Finland with the sage spectrometer coupled to the ritu gas-filled separator [10, 11]. sage comprises the Jurogam II germaniumdetector array for γ-ray spectroscopy and a highly seg
Summary
Data obtained from a Gammasphere study favoured the 7/2+[624] band-head configuration, which identified two rotational bands with the intensity flow predominantly through stretched E2 multipolarity intraband transitions [8] From this previous study, the yrast bands were determined to lie 355 keV above the ground state, and linked to the ground state via a multiplet γ-ray decay. A subsequent γ-ray study using Jurogam II at the University of Jyvaskyla (jyfl) measured the interband M 1 transitions in addition to the stretched intraband E2 transitions, extended the level scheme to higher spins, and assigned the 9/2−[734] ground-state configuration to be the band-head. After compound nucleus formation, the emission of two neutrons, and prompt γ rays and electrons, the evaporation residues passed through the ritu gas-filled separator and were implanted into the great focal-plane spectrometer [14] for decay spectroscopy measurements. The experiment was performed at jyfl, Finland with the sage spectrometer coupled to the ritu gas-filled separator [10, 11]. sage comprises the Jurogam II germaniumdetector array for γ-ray spectroscopy and a highly seg-
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